GEMINI Plus USER MANUAL

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1 GEMINI Plus USER MANUAL English Language Metric Units Version 002

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3 GEMINI Plus USER MANUAL English Language Metric Units Version 002 USER INFORMATION For your information, please fill in the following information SERIAL NUMBER OF THE TANK UNIT: SERIAL NUMBER OF THE WRIST UNIT: DATE OF PURCHASE: PLACE OF PURCHASE: ADDRESS: CITY: STATE: ZIP CODE: PHONE NUMBER: 1

4 2 TABLE OF CONTENTS Table of Contents 2 Figures Index 4 Limited Warranty and Liability Statement 5 Product Certifications / Patent Information 7 Introduction 9 Overview 9 User & Environmental Adaptation 9 Altitude Acclimatization 10 Water Temperature Compensation 11 Microbubble Compensation 11 User Conservatism 11 Previous Dive Profile 11 Salt/Fresh Water Compensation 11 Workload Compensation 12 Theory of Operation 12 NITROX-specific Functions 13 Equivalent Air Depth 13 Central Nervous System (CNS) Oxygen Toxicity 13 Pulmonary, Whole Body (OTU) Oxygen Toxicity 15 Installation 15 Tank Unit Touch Contacts 17 Activation 17 Operating Modes 19 Self-Diagnostic Mode 19 Predive Prediction Mode 20 Surface Mode 21 Subsurface Mode 24 Decompression Mode 25 Training Mode 29 CNS/OTU Toxicity Display 30 O 2 Mix Display 32 Information Display 32 Logbook Mode 33 Ascent Rate Bar Graph 35 PBAT & SBAT TU Battery Voltage 37 Post-Dive Interval 37 Sleep (Pseudo-Off) Mode 37 Exceeding Depth Rating 38 Programming Mode 38 Programming NITROX Disabled 39 Programming Menu 41 Programming NITROX Enabled 45 Explanations 47 Altitude Diving 47 Ascent Rate 48

5 TABLE OF CONTENTS (CONTINUED) Ascent Rate Bar Graph 48 BATT 49 Bottom 49 BP 50 Ceiling 50 Depth 51 Dive 51 Max Depth 51 Metric 52 Mission OTU Clock 52 Remaining Time Air 52 Remaining Time NDC 52 Remaining Time DEC 53 Surface Time 53 Tank 53 Temp 53 Time-To-Fly 53 Audible & Visual Alarms 54 User Defined Maximum Depth 54 Two-Minute Warning 55 Entering Decompression Mode Meter Decompression Stop Warning 55 Low Cylinder Pressure 55 Cylinder Pressure < 5 Minute Deco Time 56 Low Battery Voltage 56 Breathing Parameter 56 Oxygen Tolerance Units (OTU) Warning 56 Central Nervous System (CNS) Oxygen Toxicity 56 Maximum PO 2 Alarm 57 Ascent Rate Alarm 57 Depth Less Than Ceiling 57 Cylinder Pressure Transducer Alarm 57 Depth Transducer Alarm 58 Data Storage Types & Capacity 58 User Configurable Options 59 Questions & Answers 63 Care and Maintenance 65 Rinsing and Cleaning 65 High-pressure Transducer Care 65 Battery Type and replacement 66 Battery Care 67 Technical Specifications 68 Product Assistance, Repair & Maintenance 70 Replacement Parts 70 Analyst Personal Computer Interface 70 3

6 FIGURES - INDEX Figure Page Number 1 Self-Diagnostic Mode 19 2 Surface Mode, Primary Screen, With Nitrogen 22 2a Surface Mode, Primary Screen, No Nitrogen 23 3 Surface Mode, Alternate Screen, With Nitrogen 22 3a Surface Mode, Alternate Screen, No Nitrogen 23 4 PreDive Prediction Mode Menu 41 4m PreDive Prediction Mode, Primary Screen 20 & 42 6 InFormation Display (Menu) 42 7 InFormation Display 33 & 42 8 Subsurface Mode, Normal Dive, Primary Screen 24 9 Subsurface Mode, Normal Dive, Alternate Screen Subsurface Mode, Decompression, 6 Meter Ceiling, Primary Display 27 10a Subsurface Mode, Decompression, 27 Meter Ceiling, Primary Display Subsurface Mode, Decompression Programming Mode (logbook Menu) Logbook Mode, Primary Screen Logbook Mode, Alternate Screen Oxygen Toxicity Warning Display Programming Mode (Oxygen % Menu) 32 & 46 17a Programming Mode (Setting Oxygen %) Programming Mode (Cylinder Size Menu) 44 18a Programming Mode (Setting Cylinder Size) Programming Mode (Conservatism Menu) 43 19a Programming Mode (Setting Conservatism) Programming Mode (Depth Alarm Menu) 43 20a Programming Mode (Setting Depth Alarm) Ascent Rate Bar Graph Tank Unit Touch Contacts 16 4

7 Limited Warranty To the original purchaser ( OWNER ) only, Cochran Undersea Technology, a division of Cochran Consulting, Inc. ( COCHRAN ), represents this Product to be free of defects in both materials and workmanship under normal, recreational SCUBA use for 24 months from the date of shipment from COCHRAN to the Authorized Dealer or Distributor. For purposes of establishing warranty eligibility, this date may be noted on the original product box, or can be determined by contacting COCHRAN. Any defective Product, unless cause is specifically excluded in the Warranty Conditions and Limitation section below, will, at the sole discretion of COCHRAN, be repaired, or replaced with a new or refurbished unit of comparable or better function and/or condition. COCHRAN is not responsible for any direct, incidental, or secondary damages as a result of Product malfunction WARRANTY LIMITATIONS AND EXCLUSIONS Product must have been obtained from a COCHRAN Authorized Dealer. Contact COCHRAN for verification of dealer status. This Warranty is not transferable. The warranty registration card must be sent to COCHRAN within 15 days of the purchase in order to validate Limited Warranty Failure to provide proper care for this Product will render this Limited Warranty null and void. Damages or malfunction resulting from accidental or deliberate abuse, tampering, battery leakage, exceeding maximum intended operating depth or other parameters, extreme heat or cold, or other conditions that COCHRAN deem to be outside the intended scope of this Limited Warranty are not covered. Plastics, o-rings, batteries, battery life, and flooded battery compartments are NOT covered by this Limited Warranty. This Limited Warranty will be rendered null and void if an attempt is made to establish communications with the Tank Unit with any hardware and/or software other than the Cochran approved ANALYST Interface. OWNER is responsible for shipping this Product to COCHRAN for service and paying all associated costs, including shipping, insurance, and import duties. OWNER may take Product to an Authorized Dealer to arrange service under terms of this Limited Warranty. COCHRAN will return Product to OWNER or Dealer via a method and carrier of its choosing. Costs for requested expedited return shipping will be the responsibility of OWNER. Product returned for service under terms of this Limited Warranty must be accompanied by a photocopy of the original sales receipt in order for warranty repair or replacement to be performed if the Warranty Registration Card is not on file. 5

8 6 STATEMENT OF LIMITED LIABILITY A mathematical model is used by this Product to calculate physiological effects of SCUBA diving related to the use of compressed air or other breathing mixtures while at depth. Such effects specifically relate to nitrogen absorption into and elimination from body tissues, as well as effects of oxygen used in Enriched Air Nitrox breathing mixtures. However, because of the number of variables and the varying degrees to which they may affect individuals engaged in SCUBA diving, COCHRAN DOES NOT GUARANTEE THAT USE OF THIS PRODUCT WILL PREVENT DECOMPRESSION SICKNESS OR ANY OTHER CONDITION OR INJURY INCURRED WHILE USING THIS PRODUCT. These influencing variables may include, but are not limited to, dehydration, obesity, age, old injuries, or other physical conditions on the part of the diver, or environmental extremes of heat or cold, or poor training, or diving practices, any of which may promote the onset of decompression sickness or other harmful effects. This Product is sold and intended to be used only as a guide, providing the TRAINED and CERTIFIED diver the information needed to make his own intelligent diving decisions. It is expressly understood that by buying and/or using this Product the Diver assumes ALL RISK as to its operability, reliability, quality, performance, accuracy, and suitability for his diving style. Furthermore, Diver recognizes that this Product is an electronic instrument being used in a hostile environment and is subject to failure, which may manifest itself in a number of ways. COCHRAN and its distributors and retailers will not be held liable for any personal injuries or other damages resulting from its use, even if COCHRAN has been advised of such occurrences or damages. This product must be handled with care and properly maintained to assure the optimum performance. Users must possess the proper training for SCUBA diving activities and should be fully educated in the operation of this product. Users are encouraged to possess and utilize a redundant (backup) computer for their dive planning and execution. Divers are always encouraged to dive with a buddy at all times. COCHRAN strongly supports and agrees with maximum depth limits of 40 meters for recreational SCUBA diving, as established by recognized training and certification agencies, and in no way encourages diving beyond these or any prudent lesser limits as may be necessitated by environmental, diver-specific, or other conditions. THE WARRANTY AND REMEDIES SET FORTH ABOVE ARE EXCLUSIVE AND IN LIEU OF ALL OTHERS, WHETHER ORAL OR WRITTEN, EXPRESSED OR IMPLIED. COCHRAN UNDERSEA TECHNOLOGY SPECIFICALLY DISCLAIMS ANY AND ALL IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

9 No Cochran Undersea Technology dealer, agent, or employee is authorized to make any modification, extension, or addition to this warranty. CAUTION!!! ACCIDENTAL OR INTENTIONAL LOSS OF BATTERY POWER WILL CAUSE ALL PREVIOUS DIVE NITROGEN LOADING TO BE LOST. THIS MAY AFFECT NITROGEN CALCULATIONS ON NEAR-FUTURE DIVES. AFTER A BATTERY CHANGE, CONFIRM THAT NO-DECOMPRESSION TIME DATA IS REASONABLE DURING THE PRE-DIVE PREDICTION MODE. DIVE- OF-DAY NUMBER GOING TO ZERO IMMEDIATELY AFTER CHANGING BATTERIES IS ANOTHER INDICATION OF A LOSS OF NITROGEN LOADING. IF LOSS OF NITROGEN LOADING OCCURS, COCHRAN STRONGLY RECOMMENDS THAT A PERIOD OF 24 HOURS ELAPSES BEFORE MAKING ANY SUBSEQUENT DIVES. FCC Label FCC ID: LYP This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Interference Statement NOTE: This equipment has been tested and found to comply with both the limits for a Class B digital device and an intentional radiator, pursuant to Part 15, Subpart B/C of the FCC Rules. This equipment generates, uses, and radiates radio frequency energy. If not installed and used in accordance with the instructions, it may cause interference to radio communications. The limits are designed to provide reasonable protection against such interference in a residential situation. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause interference to radio or television reception, which can be determined by turning the equipment on and off, the user is encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate the receiving antenna of the affected radio or television. Increase the separation between the equipment and the affected receiver. Connect the equipment and the affected receiver to power outlets on separate circuits. Consult the dealer or an experienced radio/tv technician for help. Modifications Changes or modifications not expressly approved by Cochran Consulting, Inc. could void the user s authority to operate the equipment. 7

10 Shielded Cables This product is designed to be used only with the Analyst interface cable (RS- 232) to maintain compliance with FCC Regulations. Patent Information Protected under one or more Foreign or US patents. Other patents may be pending. All specifications subject to change without prior notice. GEMINI and Analyst are registered trademarks of Cochran Consulting, Inc. Energizer is a registered trademark of the Eveready Battery Co., St. Louis MO. Copyright 1999 Cochran Consulting Inc. 8 (C) 1999 Cochran Undersea Technology GEMINI Plus Manual English - Metric Version 001m

11 Introduction Your GEMINI Plus Dive Computer from Cochran Undersea Technology is one of the most advanced instruments made for this application. It incorporates more user-programmable functions than any other dive computer made, yet is one of the simplest to use. You may enter personal preferences, dive site, and condition-specific settings. The GEMINI Plus calculates these factors in the background, displaying to you, the diver, the critical information you need, in an easy to comprehend display. The GEMINI Plus is the first dive computer to implement a Training Mode which enables the computer to record and store data in shallow water environments (swimming pools, shallow lakes, etc.). This manual is intended for use with the GEMINI Plus with and without the NITROX function being enabled. Sections of this manual that apply or refer to the NITROX capabilities of the GEMINI Plus are in Italic type. The GEMINI Plus: Overview User & Environmental Adaptation In addition to its standard time/depth-based decompression algorithm, the GEMINI Plus is one of the new breed of Dive Computers that adapts its algorithm to the user s diving environment and style as originally pioneered by COCHRAN. All of COCHRAN s newer dive computers incorporate this capability. The factors used for this Adaptation in the GEMINI Plus are: Altitude Acclimatization Salt/Fresh Water Compensation User Conservatism Workload Water Temperature Microbubble Previous Dive Profile However, the GEMINI Plus allows the diver, via the optional Analyst PC Interface, to set Temperature compensation to the Normal or the Reduced Mode should the diver deem a particular diving situation would so warrants. Calculation of Central Nervous System Oxygen Toxicity (CNS), Mission Oxygen Tolerance Units (OTU's), and the Partial Pressure of Oxygen (PO 2) is yet another added feature of this algorithm. Twelve half-time compartments ranging from 5 minute to 480-minute theoretical tissue groups are used. You will find that this unit is extremely user friendly and can be customized to your individual diving conditions and practices. Factors that influence the decompression algorithm of your GEMINI Plus are detailed as follows. 9

12 Altitude Acclimatization Driving or flying to a dive site significantly higher in altitude requires special modifications to the sea level algorithm. The GEMINI Plus regularly samples the ambient barometric pressure to determine these changes in altitude. Accordingly, the decompression algorithm is changed to reflect these barometric pressure changes. Note that temperature and weather systems also affect barometric pressure and hence, apparent altitude. Using the Time To Fly digits, the number of hours required to adapt to the new altitude is immediately known to the diver. If a significant altitude change occurs, a minimum of one hour should pass before diving to allow the unit to adapt to this new altitude. Rapid changes in altitude should be avoided. The dive computer may interpret a rapid change from a high altitude to a lower altitude as a dive. Should this occur, removing the batteries for ten minutes would reset the computer, however, all tissue nitrogen loading will also be lost. Should it be desired to initiate a dive PRIOR to completing the adaptation time, the GEMINI Plus will treat this dive as a repetitive dive in its algorithm, taking into account the "residual" nitrogen present due to travel to altitude. There are two methods of compensating for altitude. Via the Analyst Personal Computer Interface, ZONE or SEAMLESS compensation for altitude may be selected. In ZONE, all altitudes less than 600 meters above sea level use the sea-level algorithm. At altitudes greater than this, altitude compensation is seamless; literally, every small fraction of gained altitude is considered in adjusting the algorithm. ZONE will reduce the occurrences of obtaining slightly different altitude readings and corresponding no-decompression (NDC) limits when diving within a given area. ZONE reduces the accuracy of altitude compensation for the first 600 meters above sea level, treating altitudes below 600 meters as sea level. The advantage in ZONE is that changes in apparent altitude (due to temperature or weather changes at sea level) will not affect NDC computations. In SEAMLESS, the algorithm is adjusted for extremely small changes in altitude. A difference in altitude may be seen from day-to-day at a given dive site due to temperature or weather systems and their effect on barometric pressures. SEAMLESS will provide the most accurate altitude compensation algorithm, but normal variations in atmospheric barometric pressure may affect the nodecompression time which is more predominantly seen in the Pre-dive Prediction forecast. WARNING: While your GEMINI Plus will automatically adjust its no decompression algorithm for altitude, you should NOT attempt to dive at altitudes greater than 300 meters above sea level without first completing a sanctioned altitude diving course from a recognized training agency for recreational diving. The GEMINI Plus should not be used for this type of diving by anyone without this important training. 10

13 Water Temperature Diving in cold water can lower a diver's core and skin temperature, affecting the gas exchange rate of the body s tissues. The GEMINI Plus features two modes of Temperature compensation, Reduced or Normal, in the Normal Mode the GEMINI Plus progressively makes its nitrogen algorithms more conservative as the water temperature declines below 25 degrees C. Above this water temperature, there is a minimal amount of temperature compensation. In the Reduced Mode, the algorithms are made more conservative by a fixed amount regardless of water temperature. If the diver is wearing an insulated dry suit and is relatively warm even in cold water, this temperature compensation factor may be set to the Reduced Mode at the divers discretion using the Analyst software. Microbubble There are several theories regarding the method by which a nitrogen bubble forms from a microbubble which was formed from micronuclei. Currently, the predominant theory states that more rapid ascents accelerate bubble formation. The GEMINI Plus accounts for this by progressively increasing its compensation as the diver s ascent rate exceeds 9 meters-per-minute (mpm). User Conservatism Current dive computers cannot tell if a diver is dehydrated, tired, overweight, a smoker, or has another physical issue requiring additional conservatism in the nitrogen algorithm. The GEMINI Plus allows the diver to input an added degree of conservatism to the nitrogen algorithm from 0 to 50 percent in one-percent increments.. This can be done via the Programming Mode or with the Analyst Personal Computer Interface. Previous Dive Profiles Under some circumstances, recent dive activity can have an effect on nitrogen loading, particularly if the diver engages in inverted profile diving. This occurs when a deep dive is followed by an even deeper dive. This recent dive history is used to compensate the nitrogen loading for the current dive. Sea Water/Fresh Water Recognition (High/Low Conductivity) There is approximately a three-percent difference in depth readings taken in fresh water versus seawater. Some dive computers are calibrated in meters of fresh water and some are calibrated in meters of salt water. Diving in a medium different from what the dive computer is calibrated will cause apparent depth errors. Only COCHRAN dive computers, including the GEMINI Plus, actually determine the type of diving medium and compensate the depth reading accordingly. This accomplished by measuring the conductivity of the water during a dive. Caution must be taken in interpreting this reading since some apparent fresh water is actually high in minerals or contaminants and is correctly compensated as salt water (high conductivity). This commonly occurs in some caves, springs and lakes. 11

14 Workload Compensation When a diver s work rate or exertion level increases, he consumes more breathing gas (air) and his Breathing Parameter (BP)/ Surface Gas Consumption (SGC) increases. The diver exchanges and retains higher levels of nitrogen in his tissues at a high work rate as compared to a low work rate. As work rate increases, the GEMINI Plus compensates by progressively increasing the conservatism of its nitrogen algorithms. The Workload Compensation starts when the diver s BP exceeds 10 and reaches maximum compensation at a BP of 98. For accurate Workload Compensation the cylinder size, in liters, must be set correctly. This can be done via the Programming Mode or with the Analyst Personal Computer Interface. Theory of Operation The GEMINI Plus Dive Computer consists of two component parts, the Tank Unit (TU) and the Wrist Unit (WU), the TU contains the computer s electronics and the WU displays the information to the diver. Wrist Unit The Wrist Unit consists of a Liquid Crystal Display (LCD) screen that is the primary method of conveying information to the Diver. The information is presented in an easy to read and understand layout. The Wrist Unit is supplied with TACLITE, the night vision safe red Backlight. Two ENERGIZER brand N- Cell Size Alkaline batteries power the WU. The WU will receive information from the GEMINI Plus s TU from approximately 91 centimeters; the actual distance will vary depending on the orientation of the WU to the TU. When the WU is beyond the communications range of the TU the WU s display will flash. When the WU is back in communication with the TU the display will cease flashing. Tank Unit The TU contains the High-pressure transducer assembly, the Depth/Altitude Sensor, and the computer s electronics. The TU performs all of the time-depth calculations and also stores the detailed statistics and profile information. The TU transmits all information to the WU once per second where it is displayed. Four ENERGIZER brand AA-cell batteries power the TU; these batteries can be Alkaline, Lithium, Rechargeable, Tester or non-tester. NOTE: The WU and TU contain NO USER SERVICABLE PARTS. If the lens is removed from the WU and/or the lid from the TU, it will VOID the limited warranty. 12

15 Enriched Air NITROX NITROX Specific Functions Your GEMINI Plus has the capability of providing the diver with the ability to program the percentage of oxygen in the breathing mix from 21.0% to 50.0% in 0.1% increments. This is accomplished via the Programming Mode or the Analyst PC Interface. Equivalent Air Depth Your GEMINI Plus uses Equivalent Air Depth (EAD) in determining the nodecompression limits for each individual dive. A standard NOAA equation is used to determine the EAD based upon the oxygen percentage entered. This equation is: EAD = (1 - O 2 %) (D + 10) Where O 2 is entered in decimal form and D is the actual depth in meters. For example, if you were diving with NOAA II (36% oxygen) to 21 meters, the EAD used for determining your no-decompression limit would be: EAD = (1-.36) (21+10) = meters Therefore, the no-decompression time for this example would be calculated to an EAD of meters. Central Nervous System (CNS) Oxygen Toxicity An additional consideration for the NITROX diver is Oxygen Toxicity. Your GEMINI Plus will provide audible and visual warnings to alert you to this hazardous condition Maximum exposure time for a given depth is calculated based on the Partial Pressure of oxygen (PO 2). The following standard formula is used to determine the PO 2: 13

16 D X O 2 % = PO 2 level Where O 2 is entered in decimal form and D is the actual depth in atmospheres absolute. For example, if you were diving to 26 meters with NOAA II your PO 2 level would be: ( ) or 3.6 X.36 = which would be rounded up to PO 2 = 1.3. PO2 levels from 0.5 to 1.6 are calculated. Exceeding a PO 2 of 1.6 will greatly increase the probability of the immediate onset of CNS Oxygen Toxicity. While various training organizations have established maximum PO 2 limits, the maximum exposure times and their associated PO 2 levels used in this dive computer's calculations are shown on the following table: PO 2 LEVEL Max Bottom Time (minutes) (Based on CNS Exposure) Your dive computer calculates CNS or OTU toxicity percentages and it issues a unique, five double-beep audible alarm once per minute should you reach 50 percent of the associated maximum limit. In addition to this audible warning, the WARNING legend will appear and flash AND the TEMPerature digits will be replaced with the current calculated CNS Oxygen Toxicity percentage. This warning will continue until the calculated toxicity percentage is less than 50 percent. For example, the maximum bottom time exposure for a PO 2 level of 1.4 is 149 minutes. Once you reached 75 minutes of bottom time with a PO 2 of 1.4, this alarm would be issued since 75 minutes is 50% of 149 minutes. At a PO 2 of 1.5, this alarm would be issued at 55 minutes, etc. 14 NOTE: While all other audible alarms of the dive computer consist of five long beeps, the toxicity audible alarm consists of short doublebeeps that sound for five seconds.

17 WARNING: It is possible in certain diving circumstances to reach an Oxygen Toxicity limit well before reaching a no-decompression limit. For this reason, a diver who has successfully completed a sanctioned NITROX diving course from a recognized certifying agency should only conduct NITROX diving. NOTE: By the accepted definition of CNS Toxicity, if a PO 2 value greater than 1.6 ATA is calculated, the CNS Toxicity will be 100%. Pulmonary, Whole Body (OTU) Oxygen Toxicity Another key function to recognize when breathing mixtures with an elevated O 2 percentage is Pulmonary Oxygen Toxicity, also called Whole Body Toxicity. This is a Cumulative development, which must also be tracked accurately, and is of particular importance should a diver require recompression therapy or have extended exposure to elevated levels of O 2. The GEMINI Plus monitors and computes this longer-term effect as Oxygen Tolerance Units (OTUs) based on Bill Hamilton s MODIFIED REPEX method of oxygen exposure management. We wish to thank Dr. Bill Hamilton for working with us and sharing his considerable knowledge in the areas of oxygen toxicity. Installation The Tank Unit (TU) high-pressure sensor installs into a high-pressure port of your first-stage regulator. Your Authorized Dealer should do this at the time of purchase. Should you choose to install the TU yourself: 1. Remove your current high-pressure hose or the high-pressure plug from your first stage regulator. 2. Lightly lubricate the sensor o-ring only with a lubricant approved for use with Enriched Air NITROX equipment. DO NOT USE SILICONE GREASE. 3. Screw the sensor, HAND TIGHT, into the first-stage high-pressure port 4. Using the supplied wrench, a Scuba Tool, or thin 9/16" open-end wrench, snug the high-pressure transducer connection taking caution to not overtighten. DO NOT use tools such as vise-grips or channel lock pliers. These tools can damage the transducer and such damage is not covered under the limited warranty. CAUTION: DO NOT use your hand to tighten the high-pressure connection. This procedure should only be accomplished by using the appropriate tool placed over the metal nut of the high-pressure connection. It must not be overtightened. 15

18 With the first stage properly attached to a filled SCUBA cylinder, slowly open the cylinder valve. Once the valve has been opened, listen to the TU s high-pressure connection for any escaping gas. If possible, completely immerse the tank and regulator in water to see if bubbles form around your connection. If any gas leak is seen or heard, immediately turn the gas off by closing the cylinder valve and take the entire regulator system to the place where you purchased your GEMINI Plus. The Tank Unit (TU) clips to a low-pressure hose close to the first-stage. It is recommended that the TU be located on the divers left side. When clipping the TU onto the low-pressure hose, a rolling motion will provide better results rather than pushing the TU straight down onto the hose. The Wrist Unit (WU) may be worn on the wrist or attached to your Buoyancy Control Device with the optional retractor. Figure 22 Tank Unit Touch Contacts 16

19 Tank Unit Touch Contacts For identification purposes, place the GEMINI Plus TU face down with the mounting clips facing up and the battery caps toward the bottom (refer to Figure 22, page 16). There are three contacts on the top end of the tank unit. The closest contact toward the high-pressure transducer cable is contact 1; the middle contact is Contact 2, while the contact farthest to the bottom is Contact 3. The Contacts are used to: Turn the unit on by sensing wetted Contacts 1 & 2; Enter Logbook Mode by sensing wetted Contacts 1 & 2; Enter Programming Mode by sensing shorted Contacts 1 & 2; Step through Programming functions by sensing shorted Contacts 1 & 2; Increment Programmable options by sensing shorted Contacts 2 & 3; Determine water conductivity when in a dive via Contacts 1 & 2 & 3; Communicate with the Analyst PC Interface via Contacts 1 & 2 & 3. It is important that the Contacts be kept clean and dry when the computer is not in use. To clean, rinse with fresh water. Do not use solvents. Activation The TU will automatically activate when it senses a cylinder pressure greater than 14 BAR or it may also be manually activated by bridging touch contacts 1 and 2 located on the underside of the tank unit, with wetted fingers NOTE: If the TU is activated by cylinder pressure it will issue three beeps, if it is activated by the touch contacts it will issue five beeps. You cannot manually turn the TU off. The TU will turn off: 1. After 30 minutes if no tank pressure is sensed and no dive is made. 2. After all 12 half-time compartments are completely off-gassed on repetitive dives. During an extended surface interval, the TU will enter a sleep mode to conserve battery life. After a dive, your GEMINI Plus will enter its sleep mode after a surface interval of 40 minutes. During this sleep mode, all off-gassing calculations continue and current surface interval and time to fly can be viewed by activating the TU. Once awakened from its sleep mode, the TU will remain on for 30 minutes before re-entering the sleep mode. This assumes, of course, that no repetitive dive is initiated between each wake-up. NOTE: The GEMINI Plus TU will not enter the sleep mode or turn off as long as cylinder pressure is being applied to the TU. 17

20 To activate the WU tap continuously on the lower left corner of the face for five seconds or until the display becomes active. Care has been taken to reduce the occurrence of the WU being accidentally activated during transport, therefore the WU may have to be tapped for a longer period of time. This same tapping action is used to select the alternate display. The alternate display is shown for three seconds before returning to the normal display. The TACLITE active backlighting for the WU display is also activated whenever the alternate display is selected. The TACLITE will remain illuminated for approximately 10 seconds. Since all diving calculations are made by the TU, it is possible to activate the WU underwater should you mistakenly forget to do so prior to the dive. Once activated, the WU will immediately display the current diving data being calculated by your TU. During the dive, it is not possible to turn the WU off. Once back on the surface, you can manually turn the WU off. This is recommended as a battery saving measure since all calculations are being performed by the TU. To turn the WU off on the surface, continuously tap the lower left-hand corner of the WU face, in the same manner as that used to activate the unit, until the display goes blank. With a little practice, you will learn how much tapping is required to turn off the WU. 18

21 Operating Modes Self-Diagnostic Mode When you turn on the GEMINI Plus, both the TU and WU perform self-diagnostic tests before displaying information about your current dive status. During these tests, all of the legends and digits on the WU illuminate for approximately five seconds. During these tests if an error or malfunction is detected, the unit will turn itself back off. Some of the reasons are: 1. Altitude over 4,600 meters 2. Battery voltage too low 3. Internal diagnostic fault Upon completion, your computer displays its WU serial number and then enters the Surface Mode. Fig-1 Self-Diagnostic Mode Explanation of Page Layouts The following pages provide a snapshot of the screen displays for each of the computers various functional modes, showing: 1. An illustration of the WU display 2. The LEGEND displayed 3. The MEANING of that legend 4. The VALUE depicted under that legend Any WARNINGS or NOTES about that mode will be displayed on this page. 19

22 PreDive Prediction Mode The PreDive Prediction Screen is accessed through the Tank Unit Programming menu (see Programming, page 38). This enables the diver to view the PreDive Prediction information at the touch of the contacts. The PreDive Prediction depths start at 9 meters and increase in 3-meter increments. PreDive predictions will terminate when the No-Decompression (NDC) time prediction is less than two minutes or a maximum depth of 99 meters is reached. The GEMINI Plus calculates the PreDive Prediction NDC times based on the percentage of oxygen in the breathing gas, entered by the diver. (If the unit is not NITROX enabled, these tables are based on the default mixture, 21%). Apparent altitude, Temperature Compensation, additional Conservatism and residual nitrogen can effect PreDive Predictions. Refer to the Analyst for information about how to modify parameters. During the PreDive Prediction Mode, the unit will compute and display the maximum NDC time and PO 2 value at that depth. The PO 2 value is displayed under the TANK legend and will be displayed even if the computer is not NITROX enabled. The PO 2 value is displayed times 10. For example, a PO 2 of.7 would be displayed as 7.Once the maximum Predive Prediction depth has been reached the unit will return to the Surface Mode. NOTE: The PreDive Prediction NDC times observed may differ due to the effects of Altitude, Temperature Compensation, additional Conservatism, residual nitrogen and, if the NITROX functions are enabled, the O 2 percentage that the unit is programmed for. Fig-4m Primary Screen REMAINing TIME NDC 2:17 (2 hours 17 minutes) TANK indicating PO 2.5 ATA PO 2 Predicted DEPTH 12 meters 20

23 PreDive Prediction Mode (continued) The following chart displays the beginning, sea-level no-decompression times for the depths from 09 to 57 meters for the U.S. Navy, DSAT, and the GEMINI Plus based on air as the breathing gas. Beginning NDC Limits BEGINNING NO-DECOMPRESSION LIMITS (HOURS: MINUTES) DEPTH U.S. NAVY DSAT GEMINI Plus 09 METER 5:25 12 METER 3:23 2:22 2:43 15 METER 1:41 1:21 1:35 18 METER 1:01 :56 1:04 21 METER :51 :41 :47 24 METER :41 :30 :35 27 METER :30 :25 :28 30 METER :25 :20 :21 33 METER :20 :16 :17 36 METER :15 :13 :12 39 METER :10 :10 :10 42 METER :10 :08 :09 45 METER :05 :07 48 METER :05 :07 51 METER :05 :06 54 METER :05 :05 57 METER :05 :05 For this chart, the Temperature factor is set to Normal, Conservatism factor is set to 0%, Altitude is zero feet and O 2% is set to 21%. Surface Mode At the completion of the Self-Diagnostic Mode, the GEMINI Plus enters the Surface Mode. The Surface Mode has two screens, a Primary Screen and an Alternate Screen. You may switch to the Alternate Screen by rotating the wrist quickly or tapping firmly on the face of the WU. The Primary Screen shows: DIVE number, time-to-fly, TEMPerature, SURFace time, TANK pressure, and MAXimum DEPTH (of the last dive). The Alternate Screen shows the last dives BOTTOM time, and breathing parameter (BP). The following sample screens are of the Surface Mode. Figure 2 & 3 shows the display with residual nitrogen (a repetitive dive). Figure 2a & 3a has no residual nitrogen. 21

24 Surface Mode (continued) Fig-2 Primary Screen, With Residual Nitrogen Approximately 10 seconds after powering up, your dive computer enters the Surface Mode. DIVE number 2 current time-to-fly 15 hours present air TEMPerature 23 O C current SURFace time 0:20 (0 hours 20 minutes) current TANK pressure BAR MAXimum DEPTH (of previous dive) 35.9 meters 22 Fig-3 Alternate Screen, With Residual Nitrogen BOTTOM time of last dive 1:02 (1 hour 02 minutes) Ending Breathing Parameter of the last dive 33

25 Surface Mode (continued) Fig-2a Primary Screen, No Residual Nitrogen DIVE number 0 current time-to-fly 0 hours present air TEMPerature 23 O C current SURFace time 0:20 (0 hours 20 minutes) current TANK pressure BAR MAXimum DEPTH (of previous dive) 0 meters Fig-3a Alternate Screen, With No Residual Nitrogen 23

26 Subsurface Mode Whether in the Surface Mode, PreDive Prediction Mode, Programming Mode, or the Logbook Mode, the GEMINI Plus will automatically enter the Subsurface Mode when the dive computer senses a depth greater than 1.5 meters and is exited when the dive computer senses a depth less than 1 meter. Information contained on the Subsurface Mode Primary Screen is: REMAINing TIME for AIR or NDC, whichever is less current ASCENT rate. CEILing if required current BOTTOM time for this dive current TANK pressure current DEPTH The Alternate Screen Shows: REMAINing TIME for either AIR or NDC, whichever is greater current TEMPerature current Breathing Parameter (BP) MAXimum DEPTH of this dive When accessed the Alternate Screen is seen for three seconds. Fig-8 Primary Screen 24 REMAINing TIME by NDC 0:22 (0 hours 22 minutes) current ASCENT rate 3-6 meters per minute Required CEILing 0 meters BOTTOM time 0:34 (0 hours 34 minutes) current TANK pressure BAR current DEPTH 14 meters

27 Subsurface Mode (continued) Fig-9 Alternate Screen REMAINing TIME by AIR 0:47 (0 hours 47 minutes) Current TEMPerature 14 O C current Breathing Parameter (BP) 34 MAXimum DEPTH 26.5 meters Decompression Mode WARNING: Your GEMINI Plus should not be used for deliberate decompression diving, but merely as an aid to assist you during ascent should you mistakenly overstay your no-decompression limit. Cochran Undersea Technology in no way encourages deliberate decompression diving. Should you exceed your NDC time limit, your GEMINI Plus will enter its Decompression Mode. Five audible warning beeps will sound and the DEC legend will appear on your WU. In this mode, the CEILing digits will display the depth at which the diver must stop and not ascend above during his final ascent. The WU will display the first Ceiling at 3 meters and continue in 3-meter increments to a maximum of 27 meters. To alert the diver to an even more hazardous situation, the Warning legend will illuminate when a ceiling of 21 meters is calculated. In the case of a ceiling greater than 27 meters the computer will issue a five-beep alarm once per minute to alert the diver to this situation, this alarm will continue until the calculated ceiling is 27 meters or less. WARNING: You should IMMEDIATELY begin your ascent to the proper CEILing depth upon hearing these warnings. 25

28 Decompression Mode (continued) If a ceiling greater than 27 meters is required, the total decompression time computed by the GEMINI Plus will rise more rapidly than for ceilings below 27 meters. The total decompression time will reflect the total decompression obligation. If the diver ascends shallower than a calculated ceiling, the computer will issue its depth shallower than ceiling alarm. The alarm will continue until you descend below the CEILing depth. Your GEMINI Plus is configured at the factory to alternate between total decompression time for two seconds and time at the current stop for two seconds. Via the optional Analyst Personal Computer Interface, you can select to have only total decompression time or stop time displayed if you so desire. CEILING is the depth to which you must ascend, BUT NOT EXCEED, for your first decompression stop. The WU display will indicate the various ceiling stop depths as follows: Ceiling Calculated Ceiling Displayed 3 meters 3 6 meters 6 9 meters 9 12 meters meters meters meters meters meters 27 NOTE: When completing your decompression stops, minor changes in your depth may occur due to swells at the surface. For this reason, you should make your stop slightly deeper than the CEILing depth. Your GEMINI Plus will continue to give decompression credit when this precaution is taken. Predicted Decompression Time at a specific stop assumes that a diver is at the required ceiling and is based on the oxygen percentage that the unit has been programmed for. However it is not necessary to be precisely at the specific Ceiling. Outgassing credit will be given that is proportional to a depth that is deeper than the specified Ceiling. Ascending above the CEILing depth will cause your GEMINI Plus to issue the depth shallower than ceiling alarm. The current depth digits and the WARNING legend will flash. Both the audible alarm and the flashing display will continue until you descend below the CEILing depth. Outgassing will continue even through the diver is shallower than the ceiling. 26

29 Decompression Mode (continued) If the diver surfaces before satisfying his decompression obligation, the Cochran GEMINI Plus will continue to give outgassing credit as if it was still in a dive at a depth of zero meters. The unit will continue to log data and perform as if actually in a dive. The unit will actually decompress as if it were at the various required decompression stops. When the decompression obligation is finally satisfied, the GEMINI Plus will begin the 10-minute PostDive Interval after which the dive will terminate are the GEMINI Plus will enter the Surface Mode. CAUTION: Ascending above the CEILing depth will cause your GEMINI Plus to issue a warning beep. The current depth digits and the WARNING legend will flash. Both the audible alarm and the flashing display will continue until you descend below the CEILing depth or the decompression obligation has been satisfied as described above. Should a diver enter the Decompression Mode, the following information is shown on the Primary Display. Fig-10 Primary Screen REMAINing TIME DEC at CEILing 0:15 (0 hours 15 minutes)* current ASCENT rate 3-6 meters per minute Required CEILing 6 meters BOTTOM time 1:23 (1 hours 23 minutes) current TANK pressure BAR current DEPTH 6.5 meters *This value is dependent upon how the dive computer is configured. If BOTH is selected, then this value will alternate between total decompression time left, the greater time, and stop time, the lesser time. At a 3 meter-stop, Total and Stop times may be the same and therefore appear not to alternate. See section regarding REMAIN TIME DEC for more information. 27

30 Decompression Mode (continued) Fig-10a Primary Display, Showing a 27-meter Ceiling REMAINing TIME DEC at CEILing 0:10 (0 hours 10 minutes)* current ASCENT rate 3-6 meters per minute Required CEILing 27 meters BOTTOM time 1:05 (1 hours 05 minutes) current TANK pressure 99.6 BAR current DEPTH 37.0 meters * This value is dependent upon how the dive computer is configured. If BOTH is selected, then this value will alternate between total decompression time left, the greater time, and stop time, the lesser time. At a 10 foot-stop, Total and Stop times may be the same and therefore appear not to alternate. See section regarding REMAIN TIME DEC for more information. 28

31 Decompression Mode (continued) Fig-11 Alternate Screen The following information is provided on the Alternate Display while in Decompression Mode. REMAINing TIME by AIR 0:30 (0 hours 30 minutes) Current TEMPerature 20 O C current Breathing Parameter (BP) 22 MAXimum DEPTH 37.2 meters TRAINING MODE The GEMINI Plus is the first dive computer to offer an operating mode designed to record and store data from training dives performed in shallow water environments (swimming pools, shallow lakes, lagoons, etc.) or calm open water environments that have less than 30-centimeter seas. In the Training Mode the GEMINI Plus enters the Subsurface Mode at a depth of 60 centimeters instead of 1.5 meters and will exit the Subsurface Mode at 30 centimeters instead of 1 meter. Also the Post Dive Surface Interval may be extended from 10 minutes up to a maximum of 30 minutes in 1-minute increments after which the dive data is stored in the computer's memory. These changes permit the Instructor to record the complete training session, including in-water surface periods, as a single dive. The Training Mode can only be enabled/disabled via the ANALYST Interface. 29

32 CNS/OTU Toxicity Display The GEMINI Plus with NITROX enabled has the ability to track Oxygen Toxicity levels for the Central Nervous System (CNS) as well as the Mission Oxygen Tolerance Units Dose (OTU). In addition, a maximum Partial Pressure of Oxygen (PO 2) warning alarm can also be set. While most other audible alarms of the dive computer consist of five long beeps, the CNS, OTU, and PO 2 have a distinctive audible alarm that consists of short double-beeps that sound once per second for five seconds. As long as one or more of these three parameters is outside its limits, the WARNING legend will illuminate and flash and the audible alarm will be repeated once every two minutes. Partial Pressure of Oxygen (PO 2): High levels of PO 2 can cause severe Oxygen poisoning. Widely different levels of PO 2 can affect individual divers. The user via the Analyst can set the PO 2 alarm to any level between 0.50 ATA and 1.60 ATA. Should the PO 2 be above the alarm set point, the warning legend will illuminate and the audible alarm will sound. As shipped from the factory, this is set to 1.40 ATA. Central Nervous System (CNS) Toxicity: Should the CNS Toxicity exceed 50% of the maximum allowable, the warning legend will illuminate and the audible alarm will sound and the TEMPerature digits will be replaced with the current calculated two digit CNS percentage. These digits on the display will be flashing along with the WARNING legend (see Figure 15 which shows a diver that has reached 92% of the allowable maximum bottom time for any PO 2). During the Surface Interval, this percentage will decrease as the CNS declines toward zero. Once this has dropped below 50%, the TEMPerature reading will return. By the accepted definition of CNS toxicity, should a PO 2 value of greater than 1.6 ATA be measured, the CNS Toxicity will be 100%. Oxygen Tolerance Units (OTU): An issue with long term breathing of higher partial pressures of Oxygen above 0.5 ATA is Pulmonary Oxygen Toxicity or sometimes called WHOLE BODY, which must be tracked properly. The GEMINI Plus will track the OTUs based on Dr. Bill Hamilton s REPEX method of oxygen exposure management. The OTU Dose is an exponential function of oxygen partial pressure and time. The time-dependent limit varies with length of time (days) that the diver continues to dive without full recovery to zero OTU. The Mission OTU Clock tracks the OTU, which is a running clock that tracks long-term Oxygen exposure. This clock may run for several weeks if frequent dives are made using high levels of PO 2. The current Mission Clock, CNS, and OTU levels can be viewed via Analyst or on the InFormation display in the Programming Mode. 30

33 CNS / OTU Toxicity Display (continued) The recovery portion of the OTU algorithm is a linear reduction of OTU over time. The Mission OTU clock is reset to 0:00 when the OTU Dose reaches zero. Should the OTU Dose exceed 50% of the maximum allowable, the audible alarm will sound and the TEMPerature digits will be replaced with the current calculated two-digit OTU Dose percentage. These digits and the WARNING legend will be flashing. Symptoms of Pulmonary Oxygen Toxicity include burning in the throat and chest, coughing, and shortness of breath. Discontinue diving and consult a Physician should any of these, or other, symptoms appear. Whatever the current CNS/OTU Toxicity level, it can be viewed on the InFormation screen in the Programming Mode (see Figure 7, page 33) Fig-15 Oxygen Toxicity Warning Screen TEMPerature 92 % CNS exposure current Breathing Parameter (BP) 26 MAXimum DEPTH 29.9 meters NOTE: If both CNS and OTU levels are greater than 50%, the more critical of the two percentages will be displayed. 31

34 O 2 Mix Display The current O 2 percentage of the NITROX Mix that the GEMINI Plus is programmed for can be viewed on the Blend Programming screen accessed via the Programming menu (see Figure 17). The NITROX Mix percentage will be displayed as whole numbers in the lower right hand corner of the display. Therefore 32.6% would be displayed as 326. Fig-17 Primary Screen Enriched Air NITROX menu screen O 2 percentage of the breathing mix 32.6% Information Display The current CNS exposure, OTU value, TU PBAT and SBAT battery voltages can be viewed on the InFormation screen (see Figure 7, page 33) which is accessed via the Programming Mode. For example, PBAT battery voltage is displayed as a two-digit number in the upper right of the display, SBAT is displayed as a two-digit number in the lower right of the display. The current CNS exposure level is displayed in the lower left as a two-digit number proceeded by a lower case "c". The current OTU value is displayed in the lower center again as a two-digit number but proceeded by a lower case "o". Both the CNS and OTU values are expressed as percentages. NOTE: If your GEMINI Plus is not NITROX enabled, the InFormation screen will display only the TU battery voltages. 32

35 Information Display (continued) Fig-7 Primary Screen InFormation Information Screen PBAT TU battery voltage 3.1 volts current CNS exposure 28% current calculated OTU exposure 18% SBAT TU battery voltage 3.1 volts Logbook Mode The GEMINI Plus's Logbook is accessed via the Tank Unit Programming Mode menu (see Programming Mode, page 38). This enables the diver to view his/her dive statistics; your GEMINI Plus has the ability to provide diving data to you in this mode for your previous 512 dives. The most recent dive will be displayed first. To move to the next dive, touch the contacts again after pausing for a few seconds. Do not use a metal object such as a coin or a knife blade to enter the Logbook Mode since it will cause the TU to exit the Programming Mode. Wait for the new data to be displayed on the WU before bridging the contacts again to go to the next dive. Access the WU's Alternate Display by tapping or rotating the WU until the display appears. It will appear for three seconds before returning to the Logbook Mode's Primary Screen. To return your GEMINI Plus to the Surface Mode bridge contacts 1 and 2 with a metal object after the final selected log has been displayed. Information contained on the Logbook Mode s Primary Display includes: DIVE of the day number Time-to-FLY at the end of the dive Maximum ASCENT rate 33

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